control: add delete command (#933)

* control: add delete command

* logDeleteQueue only when found

* use default StrEncoding for CPDelete arg

* move stats update from main transaction

* use size

* stabilize AUTH timing tests

* more iterations

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/Messaging/Server.hs

@@ -83,7 +83,7 @@ import Simplex.Messaging.Transport.Buffer (trimCR)
 import Simplex.Messaging.Transport.Server
 import Simplex.Messaging.Util
 import System.Exit (exitFailure)
-import System.IO (hPutStrLn, hSetNewlineMode, universalNewlineMode)
+import System.IO (hPrint, hPutStrLn, hSetNewlineMode, universalNewlineMode)
 import System.Mem.Weak (deRefWeak)
 import UnliftIO (timeout)
 import UnliftIO.Concurrent
@@ -304,7 +304,7 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                 where
                   putStat :: Show a => String -> TVar a -> IO ()
                   putStat label var = readTVarIO var >>= \v -> hPutStrLn h $ label <> ": " <> show v
-              CPStatsRTS -> getRTSStats >>= hPutStrLn h . show
+              CPStatsRTS -> getRTSStats >>= hPrint h
               CPThreads -> do
 #if MIN_VERSION_base(4,18,0)
                 threads <- liftIO listThreads
@@ -338,11 +338,25 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
 #else
                 hPutStrLn h "Not available on GHC 8.10"
 #endif
+              CPDelete queueId -> unliftIO u $ do
+                st <- asks queueStore
+                ms <- asks msgStore
+                stats <- asks serverStats
+                r <- atomically $
+                  deleteQueue st queueId $>>= \() ->
+                    Right <$> delMsgQueueSize ms queueId
+                case r of
+                  Left e -> liftIO . hPutStrLn h $ "error: " <> show e
+                  Right numDeleted -> do
+                    withLog (`logDeleteQueue` queueId)
+                    atomically $ modifyTVar' (qDeleted stats) (+ 1)
+                    atomically $ modifyTVar' (qCount stats) (subtract 1)
+                    liftIO . hPutStrLn h $ "ok, " <> show numDeleted <> " messages deleted"
               CPSave -> withLock (savingLock srv) "control" $ do
                 hPutStrLn h "saving server state..."
                 unliftIO u $ saveServer True
                 hPutStrLn h "server state saved!"
-              CPHelp -> hPutStrLn h "commands: stats, stats-rts, clients, sockets, socket-threads, threads, save, help, quit"
+              CPHelp -> hPutStrLn h "commands: stats, stats-rts, clients, sockets, socket-threads, threads, delete, save, help, quit"
               CPQuit -> pure ()
               CPSkip -> pure ()
 

src/Simplex/Messaging/Server/Control.hs

@@ -4,6 +4,7 @@
 module Simplex.Messaging.Server.Control where
 
 import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.ByteString (ByteString)
 import Simplex.Messaging.Encoding.String
 
 data ControlProtocol
@@ -15,6 +16,7 @@ data ControlProtocol
   | CPThreads
   | CPSockets
   | CPSocketThreads
+  | CPDelete ByteString
   | CPSave
   | CPHelp
   | CPQuit
@@ -30,6 +32,7 @@ instance StrEncoding ControlProtocol where
     CPThreads -> "threads"
     CPSockets -> "sockets"
     CPSocketThreads -> "socket-threads"
+    CPDelete bs -> "delete " <> strEncode bs
     CPSave -> "save"
     CPHelp -> "help"
     CPQuit -> "quit"
@@ -44,6 +47,7 @@ instance StrEncoding ControlProtocol where
       "threads" -> pure CPThreads
       "sockets" -> pure CPSockets
       "socket-threads" -> pure CPSocketThreads
+      "delete" -> CPDelete <$> (A.space *> strP)
       "save" -> pure CPSave
       "help" -> pure CPHelp
       "quit" -> pure CPQuit

src/Simplex/Messaging/Server/MsgStore/STM.hs

@@ -12,6 +12,7 @@ module Simplex.Messaging.Server.MsgStore.STM
     newMsgStore,
     getMsgQueue,
     delMsgQueue,
+    delMsgQueueSize,
     flushMsgQueue,
     snapshotMsgQueue,
     writeMsg,
@@ -60,6 +61,9 @@ getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
 delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
 delMsgQueue st rId = TM.delete rId st
 
+delMsgQueueSize :: STMMsgStore -> RecipientId -> STM Int
+delMsgQueueSize st rId = TM.lookupDelete rId st >>= maybe (pure 0) (\MsgQueue {size} -> readTVar size)
+
 flushMsgQueue :: STMMsgStore -> RecipientId -> STM [Message]
 flushMsgQueue st rId = TM.lookupDelete rId st >>= maybe (pure []) (flushTQueue . msgQueue)